sousa-gecko/browser/components/customizableui/docs/customizableui.md

CustomizableUI Module

The CustomizableUI module is responsible for managing the default and customized state of various surfaces within the browser. At this time, this includes surfaces like:

1. The navigation toolbar
2. The tabs toolbar (in horizontal tabs mode)
3. The bookmarks toolbar
4. The overflow panel
5. The menubar (on Linux and Windows)

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